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 <head>
  <title>CSS Test: Canvas: Embedded documents</title>
  <link rel="author" title="Ian Hickson" href="mailto:ian@hixie.ch"/>
  <link rel="author" title="Elika J. Etemad" href="http://fantasai.inkedblade.net/contact" />
  <link rel="reviewer" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/" /> <!-- 2012-03-11 -->
  <link rel="alternate" href="http://www.hixie.ch/tests/adhoc/css/model/canvas/001.html" type="text/html"/>
  <link rel="help" href="http://www.w3.org/TR/CSS21/visuren.html#viewport"/>
  <link rel="help" href="http://www.w3.org/TR/CSS21/visudet.html#containing-block-details"/>
  <link rel="match" href="root-canvas-001-ref.xht" />

    <style type="text/css">
   div { width: 10em; height: 10em; border: solid lime; background: red; padding: 0; }
   object { width: 10em; height: 10em; margin: 0; padding: 0; border: 0; }
  </style>
 </head>
 <body>
  <p>There should be no red, only a green square with white text and a lime green border.</p>
  <div><object type="text/html" data="support/root-canvas-001a.html">FAIL</object></div>

  <!-- reasoning:

    Section 9.1.1:
    # There is at most one viewport per canvas
     -> http://www.w3.org/TR/CSS21/visuren.html#q2

    Section 2.3.1:
    # the term canvas describes "the space where the formatting
    # structure is rendered."
     -> http://www.w3.org/TR/CSS21/intro.html#q4

    Section 2.3, item 5:
    # From the annotated document tree, generate a formatting
    # structure.
     -> http://www.w3.org/TR/CSS21/intro.html#processing-model

    Section 2.3, item 1:
    # Parse the source document and create a document tree.
     -> http://www.w3.org/TR/CSS21/intro.html#processing-model

    ...therefore is a viewport per rendered document. Since there are
    two documents on this page (the main one and the one in the
    object) there are two viewports.

    The question becomes, what size is the viewport on the object
    element. The spec doesn't define this, but if we consider the
    desired results of the following proposed rule:

       @viewport { overflow: scroll; }

    ...I don't think it makes sense for the viewport to be anything
    other than the size of the object element's box.

    -->

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